JP2012125841A - Welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a useful welding torch of which size can be reduced.SOLUTION: A torch body 4 includes: an outer pipe 11; and an inner pipe 12 inserted into the outer pipe 11 and having a forefront to which a tip 2 is connected. First flow passages 5a-5d are located in the inner pipe 12 on the inner side from the surface of the inner pipe 12 and provided along the axial direction of the torch body 4, and cooling water flowing toward the forefront side of the torch body 4 passes through the first flow passages 5a-5d. Second flow passages 6a-6d are located in the inner pipe 12 on the inner side from the surface of the inner pipe 12 and provided along the axial direction of the torch body 4, and cooling water flowing toward the base end side opposite to the forefront side of the torch body 4 passes through the second flow passages 6a-6d. A first communicating portion communicates the first flow passages 5a-5d with the second flow passages 6a-6d. The first flow passages 5a-5d and the second flow passages 6a-6d are arranged on the same circumference on the cross section perpendicular to the axis of the torch body 4.

Description

  The present invention relates to a welding torch.

The tip of the welding torch becomes very hot during welding. For this reason, a welding torch that cools the torch body by flowing cooling water through a flow path provided inside the torch body is used. Such a welding torch is provided with a cooling water supply path through which cooling water flows toward the distal end side of the torch body, and a cooling water return path through which cooling water flows toward the proximal end side of the torch body (patent) Reference 1). The cooling water return path is arranged radially outside the cooling water supply path in the cross section of the torch body, and the cooling water supplied to the tip of the torch body through the cooling water supply path is the cooling water return path. Collected through. By repeating such supply and recovery of cooling water, the welding torch is cooled.
JP 2002-301572 A

  However, as described above, when the cooling water return path is disposed radially outside the cooling water supply path, the outer diameter of the torch body increases. For this reason, there exists a possibility that a welding torch may enlarge.

  An object of the present invention is to downsize a welding torch.

  The welding torch according to the first invention includes a tip, a torch body, a first flow path, a second flow path, and a communication portion. The torch body has an outer tube and an inner tube inserted into the outer tube and having a tip connected to the tip thereof. The first flow path is located inward of the inner pipe surface in the inner pipe, is provided along the axial direction of the torch main body, and is a flow path through which the cooling water flowing toward the tip side of the torch main body passes. . The second flow path is located inside the inner pipe surface of the inner pipe, is provided along the axial direction of the torch body, and flows toward the base end side opposite to the distal end side of the torch body. It is a flow path through which water passes. The communication part communicates the first flow path and the second flow path. And the 1st channel and the 2nd channel are arranged on the same circumference in the section perpendicular to the axis of the torch body.

  In this welding torch, the cooling water is sent to the distal end side of the torch body through the first flow path, passes through the communicating portion, and is sent to the proximal end side of the torch body through the second flow path. Thereby, the torch body can be cooled. The first flow path and the second flow path are arranged on the same circumference in a cross section perpendicular to the axis of the torch body. For this reason, the outer diameter of a torch main body can be made small compared with the case where a 1st flow path and a 2nd flow path are arrange | positioned along with radial direction in the cross section of a torch main body. Thereby, a welding torch can be reduced in size.

  A welding torch according to a second invention is the welding torch according to the first invention, and each of the first flow path and the second flow path is circular in a cross section perpendicular to the axis of the torch body.

  A welding torch according to a third aspect is the welding torch according to the first aspect or the second aspect, wherein the first flow path and the second flow path are arranged at equal intervals on the same circumference.

  In this welding torch, it is possible to suppress the occurrence of bias in the cooling effect of the cooling water in the torch body.

  A welding torch according to a fourth invention is the welding torch according to any one of the first to third inventions, comprising a plurality of first flow paths and a plurality of second flow paths, The second flow paths are alternately arranged on the same circumference.

  In this welding torch, it is possible to further suppress the occurrence of bias in the cooling effect by the cooling water in the torch body.

  A welding torch according to a fifth aspect of the present invention is the welding torch according to any one of the first to fourth aspects of the present invention, wherein the sum of the cross-sectional areas of the first flow path and the second flow path in the cross section of the torch body is the first It is larger than the sum of the cross-sectional areas of the non-flow path portions located between the flow path and the second flow path.

  In this welding torch, the area of the portion where the cooling water flows in the cross section of the torch body is larger than the sum of the cross-sectional areas of the non-flow passage portions. For this reason, cooling capacity can be improved.

  A welding torch according to a sixth invention is the welding torch according to any one of the first to fifth inventions, and includes a plurality of first flow paths and a plurality of second flow paths. The communication portion has a plurality of communication passages that allow the one first flow path and the one second flow path to communicate with each other.

  In this welding torch, the plurality of first flow paths and the plurality of second flow paths are not communicated together at the communication portion, but the first flow path and the second flow path are connected by the communication path. It communicates one by one. For this reason, the flow of the cooling water becomes smooth and the cooling capacity can be improved.

  A welding torch according to a seventh aspect is the welding torch according to any one of the first to sixth aspects, wherein the cross-sectional area of the second flow path is larger than the cross-sectional area of the first flow path in the cross section of the torch body. .

  In this welding torch, the cross-sectional area of the second flow path is relatively large. For this reason, when a foreign material mixes with cooling water, it can suppress that a foreign material is blocked by the 2nd flow path.

  In the welding torch according to the present invention, the cooling water is sent to the distal end side of the torch main body through the first flow path, passes through the communicating portion, and is sent to the proximal end side of the torch main body through the second flow path. Thereby, the torch body can be cooled. The first flow path and the second flow path are arranged on the same circumference in a cross section perpendicular to the axis of the torch body. For this reason, the outer diameter of a torch main body can be made small compared with the case where a 1st flow path and a 2nd flow path are arrange | positioned along with radial direction in the cross section of a torch main body. Thereby, a welding torch can be reduced in size.

<First Embodiment>
[Welding torch structure]
A welding torch 1 according to a first embodiment of the present invention is shown in FIG. FIG. 1 is a cross-sectional view taken along the central axis of the welding torch 1. This welding torch 1 is an apparatus that performs arc welding by being connected to a welding wire, shield gas, and power supply source via a cable (not shown) and receiving supply of the welding wire, shield gas, and power from the supply source. The welding torch 1 includes a tip 2, a nozzle 3, a torch body 4, a plurality of first flow paths 5a-5d (see FIG. 2), a plurality of second flow paths 6a-6d (see FIG. 2), and a first communication portion 7. , The second communication part 8, the third communication part 9 and the like.

  The tip 2 is a part for contacting the welding wire and supplying electric power to the welding wire, and is connected to a distal end portion of an inner tube 12 (described later) of the torch body 4. The chip 2 is provided with a through hole 24 through which the welding wire is inserted along the axial direction.

  The nozzle 3 has a tubular shape and is provided so as to cover the periphery of the chip 2. The nozzle 3 is connected to a distal end portion of an outer tube 11 (described later) of the torch body 4.

  The torch body 4 has an outer tube 11 and an inner tube 12 inserted into the outer tube 11. A wire supply path 13 is provided at the center of the inner pipe 12 along the axial direction of the inner pipe 12, and a welding wire and a shielding gas are supplied through the wire supply path 13. Gas supply paths 14 and 15 are provided at the tip of the inner tube 12. The gas supply passages 14 and 15 are provided along the radial direction of the inner tube 12, and communicate the wire supply passage 13 with the space between the tip of the inner tube 12 and the nozzle 3. The shield gas that has reached the vicinity of the tip of the inner tube 12 through the wire supply path 13 is supplied to the tip of the inner tube 12 and the space between the tip 2 and the nozzle 3 through the gas supply channels 14 and 15. Is done.

  The first flow paths 5 a-5 d are provided along the axial direction of the torch body 4 in the torch body 4, and are flow paths through which the cooling water flowing toward the tip side of the torch body 4 passes. The “tip side” means the side where the nozzle 3 is provided, that is, the left side in FIG. Further, the “proximal end side” described later means the opposite side of the distal end side, that is, the right side in FIG. As shown in FIG. 2, the first flow paths 5 a-5 d are arranged radially outside the wire supply path 13 in the inner tube 12, and the plurality of first flow paths 5 a-5 d are around the wire supply path 13. It is arranged to surround. These first flow paths 5a-5d are arranged at equal intervals on the circumference concentric with the wire supply path 13 (see the alternate long and short dash line L1) in a cross section perpendicular to the axis of the torch body 4. In this welding torch 1, four first flow paths 5a-5d are provided, but the number of first flow paths is not limited to this.

  The second flow paths 6 a-6 d are provided along the axial direction of the torch body 4 in the torch body 4, and are flow paths through which the cooling water flowing toward the proximal end side of the torch body 4 passes. The second flow paths 6 a-6 d are disposed on the radially outer side of the wire supply path 13 in the inner tube 12, and the plurality of second flow paths 6 a-6 d are disposed so as to surround the wire supply path 13. Yes. These 2nd flow paths 6a-6d are arrange | positioned at equal intervals on the same periphery as what the 1st flow paths 5a-5d mentioned above are arrange | positioned, and 1st flow paths 5a-5d and 2nd The flow paths 6a-6d are alternately arranged on this circumference. Further, the first flow path 5a-5d and the second flow path 6a-6d are arranged at equal intervals on this circumference. In this welding torch 1, the same number of second flow paths 6 a-6 d as the first flow paths 5 a-5 d are provided, but the number of second flow paths is not limited to this.

  As shown in FIGS. 3 and 4, the first communication portion 7 is connected to the distal end portion of the first flow path 5a-5d and the distal end portion of the second flow path 6a-6d, and the first flow path 5a-5d. And the second flow path 6 a-6 d is a part that communicates with the tip side portion of the torch body 4. The first communication part 7 has a space connected in the circumferential direction, and is arranged so as to cover the periphery of the wire supply path 13. 4 is a perspective view schematically showing only the first flow paths 5a-5d, the second flow paths 6a-6d, and the first communication portion 7 for easy understanding.

  As shown in FIGS. 1 and 5, the second communication portion 8 is connected to the base end portions of the plurality of first flow paths 5 a-5 d, and the plurality of first flow paths 5 a-5 d are connected to the base of the torch body 4. This is the part that communicates at the end part. As shown in FIG. 5, the 2nd communication part 8 has the space connected to the circumferential direction, and is arrange | positioned so that the circumference | surroundings of the wire supply path 13 and 2nd flow path 6a-6d may be covered. The second communication portion 8 communicates with a cooling water supply port 16 provided through the inner tube 12 and the outer tube 11.

  As shown in FIGS. 1 and 6, the third communication portion 9 is connected to the base end portions of the plurality of second flow paths 6 a-6 d, and the plurality of second flow paths 6 a-6 d are connected to the base of the torch body 4. This is the part that communicates at the end part. In FIG. 6, for easy understanding, the second flow paths 6 a to 6 d located on the front side of the paper surface of FIG. 6 are illustrated by two-dot chain lines. As shown in FIG. 6, the third communication portion 9 has a space connected in the circumferential direction, and is arranged so as to cover the periphery of the wire supply path 13. The third communication part 9 is located closer to the base end side of the torch body 4 than the second communication part 8. The third communication portion 9 communicates with a cooling water discharge port 17 provided through the inner tube 12 and the outer tube 11.

[Supply and discharge of cooling water]
In the welding torch 1, when cooling water is supplied from the cooling water supply port 16, the cooling water passes through the second communication portion 8 and then is divided into a plurality of first flow paths 5 a to 5 d. The cooling water flows through the first flow paths 5 a-5 d from the proximal end side to the distal end side of the torch body 4, and merges at the first communication portion 7. The cooling water merged in the first communication portion 7 is divided into a plurality of second flow paths 6a-6d, and flows in the second flow paths 6a-6d from the distal end side to the proximal end side of the torch body 4. Then, the cooling water merges at the third communication portion 9 and is discharged to the outside from the cooling water discharge port 17.

  As described above, the supply and discharge of the cooling water are repeated, and the cooling water flows through the inner pipe 12 of the torch main body 4, whereby the torch main body 4 is cooled.

〔Characteristic〕
In the welding torch 1, a plurality of first flow paths 5 a-5 d and a plurality of second flow paths 6 a-6 d are arranged side by side on the same circumference in the cross section of the torch body 4. For this reason, the outer diameter of the torch body 4 can be reduced as compared with the case where the first flow paths 5a-5d and the second flow paths 6a-6d are arranged in the radial direction. Thereby, the welding torch 1 can be reduced in size.

  Further, in the welding torch 1, the first flow paths 5a-5d and the plurality of second flow paths 6a-6d are alternately arranged at equal intervals on the same circumference. For this reason, in the torch body 4, it is possible to suppress the occurrence of bias in the cooling effect.

Second Embodiment
A welding torch 1 according to a second embodiment of the present invention is shown in FIG. In this welding torch 1, in the cross section perpendicular to the axis of the torch body 4, the sum of the cross-sectional areas of the plurality of first flow paths 5 a-5 f and the plurality of second flow paths 6 a-6 f is the first flow path 5 a-. It is larger than the sum of the cross-sectional areas of the non-flow channel portions (see the hatched portion in FIG. 7B) located between 5f and the second flow channels 6a-6f. In FIG. 7B, hatching of other parts excluding the non-flow path part is omitted for easy understanding.

  About another structure, it is the same as that of 1st Embodiment.

  In this welding torch 1, the area of the portion through which the cooling water flows in the cross section of the torch body 4 is larger than the sum of the cross-sectional areas of the non-flow passage portions. For this reason, much cooling water can be flowed and a cooling capacity can be improved.

<Third Embodiment>
A welding torch 1 according to a third embodiment of the present invention is shown in FIG. In this welding torch 1, the first communication portion 7 is configured so that one of the first flow paths 5 a-5 d and the second flow paths 6 a-6 d are adjacent to one first flow path and one second flow path. It has the some communication path 18a-18d connected. Here, the same number of four communication paths 18a-18d as the first flow paths 5a-5d and the second flow paths 6a-6d are provided.

  About another structure, it is the same as that of 1st Embodiment.

  In this welding torch 1, a plurality of first flow paths 5a-5d and a plurality of second flow paths 6a-6d are communicated one by one with a plurality of communication paths 18a-18d. That is, the 1st flow path 5a-5d and the 2nd flow path 6a-6d are connected by 1: 1. For this reason, compared with the case where the cooling water which passed through the several 1st flow paths 5a-5d is once gathered, it is divided into several 2nd flow paths 6a-6d, and the flow of cooling water is smooth. become. Thereby, a cooling capability can be improved.

<Fourth embodiment>
A welding torch 1 according to a fourth embodiment of the present invention is shown in FIG. In the welding torch 1, the cross-sectional area of the second flow path 6a-6d is larger than the cross-sectional area of the first flow path 5a-5d in the cross section perpendicular to the axis of the torch body 4.

  About another structure, it is the same as that of 1st Embodiment.

  In this welding torch 1, since the cross-sectional area of the second flow path 6a-6d is relatively large, it is possible to prevent the foreign matter from clogging the second flow path 6a-6d when the foreign matter is mixed into the cooling water.

<Other embodiments>
(A)
In the above embodiment, the first flow path 5a-5d and the second flow path 6a-6d each have a circular cross-sectional shape. However, the first flow path 5a-5d and the second flow path 6a-6d The cross-sectional shape is not limited to this. For example, as shown in FIG. 10, the first flow path 5a-5d and the second flow path 6a-6d may each have a shape surrounded by two radii of a circle and two arcs.

(B)
In the above embodiment, a plurality of first flow paths 5a-5d and a plurality of second flow paths 6a-6d are provided. However, as shown in FIG. 11, the first flow paths 5a and the second flow paths are provided. 6a may be provided one by one. However, from the viewpoint of reducing the unevenness of the cooling effect, it is desirable that the plurality of first flow paths 5a-5d and the plurality of second flow paths 6a-6d are provided as described above.

(C)
In the above embodiment, the number of the first flow paths 5a-5d and the number of the second flow paths 6a-6d is the same, but the number of the first flow paths 5a-5d and the second flow paths 6a-6d is different. Also good.

  The present invention has the effect of reducing the size of the welding torch and is useful as a welding torch.

Sectional drawing along the axis | shaft of the welding torch which concerns on 1st Embodiment. II-II sectional drawing of the welding torch in FIG. III-III sectional drawing of the welding torch in FIG. The schematic diagram which shows a 1st flow path, a 2nd flow path, and a 1st communication part. VV sectional drawing of the welding torch in FIG. FIG. 6 is a cross-sectional view of the welding torch in FIG. 1 taken along the line VI-VI. Sectional drawing of the welding torch which concerns on 2nd Embodiment. Sectional drawing of the welding torch which concerns on 3rd Embodiment. Sectional drawing of the welding torch which concerns on 4th Embodiment. Sectional drawing of the welding torch which concerns on other embodiment. Sectional drawing of the welding torch which concerns on other embodiment.

DESCRIPTION OF SYMBOLS 1 Welding torch 2 Tip 4 Torch main body 5a-5f 1st flow path 6a-6f 2nd flow path 7 1st communication part (communication part)
11 outer pipe 12 inner pipe 18a-18d communication path

Claims (7)

A tip for supplying power to the welding wire;
A torch body having an outer tube, and an inner tube inserted into the outer tube and having the tip connected to the tip thereof;
A first flow path that is located inside the surface of the inner pipe in the inner pipe, provided along the axial direction of the torch body, and through which the cooling water flowing toward the tip side of the torch body passes;
Cooling water which is located inside the surface of the inner tube in the inner tube, is provided along the axial direction of the torch body, and flows toward the base end side opposite to the distal end side of the torch body. A second flow path through;
A communication portion for communicating the first flow path and the second flow path;
With
The first flow path and the second flow path are arranged on the same circumference in a cross section perpendicular to the axis of the torch body.
Welding torch. In the cross section perpendicular to the axis of the torch body, each of the first flow path and the second flow path is circular.
The welding torch according to claim 1. The first flow path and the second flow path are arranged at equal intervals on the same circumference,
The welding torch according to claim 1 or 2. A plurality of the first flow paths and a plurality of the second flow paths;
The first flow path and the second flow path are alternately arranged on the same circumference,
The welding torch according to any one of claims 1 to 3. In the cross section, the sum of the cross-sectional areas of the first flow path and the second flow path is greater than the sum of the cross-sectional areas of the non-flow path portions located between the first flow path and the second flow path. ,
The welding torch according to any one of claims 1 to 4. A plurality of the first flow paths and a plurality of the second flow paths;
The communication part has a plurality of communication passages for communicating the one first flow path and the one second flow path, respectively.
The welding torch according to any one of claims 1 to 5. In the cross section, the cross-sectional area of the second flow path is larger than the cross-sectional area of the first flow path,
The welding torch according to any one of claims 1 to 6.

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